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# File activerecord/lib/active_record/base.rb, line 921def find_sti_class(type_name)iftype_name.blank?||!columns_hash.include?(inheritance_column)selfelsebeginifstore_full_sti_classActiveSupport::Dependencies.constantize(type_name)elsecompute_type(type_name)endrescueNameErrorraiseSubclassNotFound,"The single-table inheritance mechanism failed to locate the subclass: '#{type_name}'. "+"This error is raised because the column '#{inheritance_column}' is reserved for storing the class in case of inheritance. "+"Please rename this column if you didn't intend it to be used for storing the inheritance class "+"or overwrite #{name}.inheritance_column to use another column for that information."endendend